Pacific Islands Benthic Habitat Mapping Center (PIBHMC), Coral Reef Ecosystem Division (CRED), Pacific Islands Fisheries Science Center (PIFSC), National Marine Fisheries Service (NMFS), National Oceanic and Atmospheric Administration (NOAA)20121215CRED Optical Validation Data at the island of Ta'u in American Samoa, 2012 to support Benthic Habitat Mapping (TOAD)Photo and video imagery, track line navigation files, and log sheetshttp://www.soest.hawaii.edu/pibhmc/pibhmc_amsamoa_tau_optical.htmhttp://www.soest.hawaii.edu/pibhmc/
Optical validation data were collected using the Tethered Optical Assessment Device (TOAD), a sled equipped with underwater
video camera, still camera and lights. Camera sled deployments were conducted during the day, from the contracted vessel Bonavista II.
Data were collected in American Samoa, around the island
of Ta'u to support Benthic Habitat Mapping efforts from November 6-9, 2012.
These data provide optical observations that will be correlated with bathymetry and acoustic backscatter imagery
to develop a benthic habitat map of Ta'u. Refer to supplemental information for description of instrument and survey.
Ta'u Island is part of the Manu'a Island group in American Samoa, situated approximately 150 km
northeast of Tutuila and 20 km east of Olosega Island. Ta'u is an extremely steep, heavily vegetated high volcanic
island with almost no surrounding banks; the seafloor surrounding Ta'u drops steeply to abyssal depths. Centered at
14.23 degrees S, 169.50 degrees W, Ta'u has very little human settlement.
Optical validation data were collected using the Tethered Optical Assessment Device (TOAD), a sled equipped with
underwater video and still camera and lights. These data are used to provide ground-truth validation for benthic habitat maps
based on multibeam echosounder surveys. Camera sled deployments were conducted during the day. The duration of each tow varied
but averaged about 20 minutes of bottom time at a given location. The camera sled was deployed from a pot-hauler, mounted on the starboard
aft of the vessel. The camera sled was lowered slowly to the seafloor by paying out cable, and once close to the seafloor, an altitude of
1-2 m was maintained by making adjustments on the length of cable out, using a remote pot-hauler switch, which allowed the operator to
monitor a live video feed of the seafloor during operations. A second operator monitored the live video feed, and recorded real-time
scientific observations, as well as any comments upon the operation, on a paper logsheet.
Equipment Description: The TOAD sled consisted of a modified Phantom ROV body with a tail piece added for stability.
It was equipped with a Deep Sea Power and Light Multi SeaCam 2060 color video camera, oriented approximately 45 degrees to the seafloor
to provide a view of the seafloor as well as some view of upcoming obstacles. The sled was also fitted with a downward facing digital
still camera (Ocean Imaging System DSC12000, consisting of Nikon D90 dSLR with Nikkor 20mm F/2.8 lens), and two 50 W DeepSea Power and
Light LED lights (one to illuminate the video and one the still camera). Scaling of the digital still photographs was provided by a pair
of Deep Sea Power and Light SeaLaster 100 parallel lasers, mounted 10 cm apart. The sled was also fitted with a Tritech PA200 altimeter,
and an electronics bottle containing a compass, and depth sensor. Power to the sled, and video and data feed from the sled was conducted
via a 16mm, 150 m long coaxial cable, connected to a topside control unit. An on-screen display unit was used to overlay time, date,
depth and altitude onto the video footage.
Name & address of person collecting data:
John Rooney
NOAA IRC
NMFS/PIFSC/CRED
1845 WASP Blvd., Building 176
Honolulu, HI 96818
Data Files: Video data were recorded to miniDV tapes, and then backed up to DVD. Still images were saved to the camera's SD card and
then backed up to external hard drive. Hypack 2012 hydrographic software was used to record time, vessel GPS position, camera sled
altitude and depth, and length of cable out (entered manually). During deployments instantaneous layback calculations were performed
by Hypack, using these data, and including the measured xyz offset between the vessel GPS antenna and the pot-hauler.
File naming convention: Each tow is given a name consisting of a three-letter designator for the island area, followed
by a two-digit year and a three-digit tow number, which increments by one for each new tow around that island. For
example, during SB1216 (the 16th cruise in the calendar year 2012) the first tow was called TAU12001.
For subsequent cruises in the same year, the tow numbers will increment by 100, so the first tow
on the next cruise to Ta'u in 2012 will be tow number TAU12100. Video tape labels and paper log forms are also
annotated with the tow name; if more than one tape is required for a tow, consecutive letters are added to the end of
the tow number (TAU12100a, TAU12100b, TAU12100c...). Navigation files generated by Hypack Max follow the Hypack CHS
filename format consisting of the year, the first two letters of the platform name, the Julian date, and the hour and
minute in which the file was started, followed by the extension .raw. For example, a file begun at 1935 on Dec. 10, 2004
(Julian date 345) aboard the Carolinian would be 2004CA3451935.raw.
Time Correlation: All clocks were synchronized to UTC at the beginning of each day's operations. Two clocks were manually
synchronized to GPS-derived times: the acquisition computer clock and the internal clock of the OSD-79 on-screen
display unit.
Resource Description: Digital video and still imagery that is geo-referenced to navigation files.
2012110620121109ground conditionCompleteNone planned-169.57-169.40-14.19-14.30CoRIS Theme ThesaurusEARTH SCIENCE > Biosphere > Aquatic Habitat > Benthic HabitatEARTH SCIENCE > Biosphere > Zoology > Corals > Reef monitoring and assessment > Photographic analysis > VideographyEARTH SCIENCE > Biosphere > Zoology > Corals > Reef monitoring and assessment > MappingNoneTethered Optical Assessment Device (TOAD)Underwater videoSB1216CoRIS Discovery ThesaurusVisual Images > HabitatsISO 19115 Topic Categoryenvironment007biota002CoRIS Place Thesaurus
OCEAN BASIN > Pacific Ocean > Manu'a Group > Ta'u Island (14S169W0012)
COUNTRY/TERRITORY > United States of America > American Samoa > American Samoa > Ta'u Island (14S169W0012)
None
Please acknowledge the NOAA Coral Reef Ecosystem Division,Pacific Islands Fisheries Science Center as the
source of this information.
Pacific Islands Benthic Habitat Mapping Center (PIBHMC), Coral Reef Ecosystem Division (CRED), Pacific Islands Fisheries Science Center (PIFSC), National Marine Fisheries Service (NMFS), National Oceanic and Atmospheric Administration (NOAA)mailing and physicalNOAA IRCNMFS/PIFSC/CRED1845 WASP Blvd., Building 176HonoluluHI96818USA808 725-5360nmfs.pic.credinfo@noaa.gove-mail preferred
Pacific Island Benthic Habitat Mapping Center, Coral Reef Ecosystem Division (CRED), Pacific Islands
Fisheries Science Center (PIFSC), NOAA
Not applicableUnclassifiedNot applicableUnspecifiedComplete
Hypack 2012 includes a window for manual entry of the length of camera sled
cable paid out, a utility to enter horizontal and vertical offsets between the GPS antenna and sheave over which the
camera sled cable passes, and a built-in caternary function. Using these data, Hypack 2012 automatically estimates
the camera sled's position. Analysis of tow data indicate that horizontal positional uncertainty associated with the
location of the camera sled recorded in Hypack is plus or minus 13 m.
After a tow was completed the video tape data was reviewed by spot-checking the master and backup tape to verify that data were recorded.
Raw data files recorded using Hypack include time, horizontal position, depth information and altitude, and were copied from the acquisition computer to the data archive.
During this cruise it was possible to export sled altitude from Hypack. Tow-specific metadata were recorded in the data archive in the same location as the raw data, in a spreadsheet
that was then referred to in creating metadata records of each island where data were collected during the cruise. Raw data files were exported from Hypack as comma-delimited text files,
and following additional processing were imported into a custom Access Database for imagery classification. The benthic habitat for each tow was classified using the PIBHMC_tow
classification scheme. Five points were classified at 30 second intervals along the video and codes were inputted directly into the TOAD database. The classified results were then
imported into ArcGIS v10.1, and then saved as a shapefile. Percent scleractinian coral was color-symbolized in optical validation maps. Additional attributes include metadata for each
point, and the full results of the benthic classification. For more information on classificiation methods, refer to the PIBHMC website:
ftp://ftp.soest.hawaii.edu/pibhmc/website/webdocs/documentation/Optical-Proc-Overview.pdf
For more information on the classification scheme,refer to the PIBHMC website:
ftp://ftp.soest.hawaii.edu/pibhmc/website/webdocs/documentation/Benth-Habitat-Class-Codes.htm
20121109nonenonePacific Islands Benthic Habitat Mapping Center (PIBHMC), Coral Reef Ecosystem Division (CRED), Pacific Islands Fisheries Science Center (PIFSC), National Marine Fisheries Service (NMFS), National Oceanic and Atmospheric Administration (NOAA)mailing and physicalNOAA IRCNMFS/PIFSC/CRED1845 WASP Blvd., Building 176HonoluluHI96818USA808 725-5360nmfs.pic.credinfo@noaa.gove-mail preferredDownloadable Data
These data are not to be used for navigational purposes. NOAA makes no warranty regarding these
data, expressed or implied, nor does the fact of distribution constitute such a warranty. NOAA cannot assume liability
for any damages caused by any errors or omissions in these data, nor as a result of the failure of these data to function
on a particular system.
ASCII
Each comma-delimited record contains the UTC date and time, latitude, longitude, altitude,
vehicle depth, and water depth.
List of navigation files:
The shapefiles showing camera sled tracks listed below consist of a collection of files,
followed by these extensions: .dbf, .shp, .shx, and .prj. All file types are necessary to properly displaying the
source data.
TAU12001-028 (28 files)
ftp://ftp.soest.hawaii.edu/pibhmc/website/data/amsamoa/optical/tau/tau_toad_sb1216.zipftp://ftp.soest.hawaii.edu/pibhmc/website/data/amsamoa/optical/tau/TOAD_Tau_all2_445.jpgCD-ROMISO 9660avihttp://www.soest.hawaii.edu/pibhmc/pibhmc_amsamoa_optical_data.htmlNone
Data is available in mini Digital Video format. Contact distributor.
These data were recorded on 28 video tapes
List of video tapes:
Video Names
TAU12001, Mini DV, Master and Backup
TAU12002, Mini DV, Master and Backup
TAU12003, Mini DV, Master and Backup
TAU12004, Mini DV, Master and Backup
TAU12005, Mini DV, Master and Backup
TAU12006, Mini DV, Master and Backup
TAU12007, Mini DV, Master and Backup
TAU12008, Mini DV, Master and Backup
TAU12009, Mini DV, Master and Backup
TAU12010, Mini DV, Master and Backup
TAU12011, Mini DV, Master and Backup
TAU12012, Mini DV, Master and Backup
TAU12013, Mini DV, Master and Backup
TAU12014, Mini DV, Master and Backup
TAU12015, Mini DV, Master and Backup
TAU12016, Mini DV, Master and Backup
TAU12017, Mini DV, Master and Backup
TAU12018, Mini DV, Master and Backup
TAU12019, Mini DV, Master and Backup
TAU12020, Mini DV, Master and Backup
TAU12021, Mini DV, Master and Backup
TAU12022, Mini DV, Master and Backup
TAU12023, Mini DV, Master and Backup
TAU12024, Mini DV, Master and Backup
TAU12025, Mini DV, Master and Backup
TAU12026, Mini DV, Master and Backup
TAU12027, Mini DV, Master and Backup
TAU12028, Mini DV, Master and Backup
None
20140423
Pacific Islands Benthic Habitat Mapping Center (PIBHMC), Coral Reef Ecosystem Division (CRED), Pacific Islands Fisheries Science Center (PIFSC), National Marine Fisheries Service (NMFS), National Oceanic and Atmospheric Administration (NOAA)mailing and physicalNOAA IRCNMFS/PIFSC/CRED1845 WASP Blvd., Building 176HonoluluHI96818USA808 725-5360nmfs.pic.credinfo@noaa.gove-mail preferredFGDC Content Standards for Digital Geospatial MetadataFGDC-STD-001-1998local timeNoneNonehttp://www.coris.noaa.gov/metadata/records/html/cred_toad_tau_sb1216_2012.html6959